Horn has served in his current posts for the past eight years. He’s overseen “The Departed,” “Happy Feet,” “Million Dollar Baby,” “The Last Samurai,” “300,” “Batman Begins,” “Ocean’s Eleven” and its two sequels and the Harry Potter series, which recently became the highest-grossing film franchise in history.

Before joining Warner Bros., Horn served as chairman and CEO of Castle Rock Entertainment, which he co-founded in 1987. He oversaw “Seinfeld,” “The Shawshank Redemption,” “A Few Good Men” and “The Green Mile.”